Cosmic Plastics E4940S Mineral Filled Epoxy Molding Compound

Login to see your most recently viewed materials here. Or if you don't have an account with us yet, then click here to register.

Cosmic Plastics E4940S Mineral Filled Epoxy Molding Compound
Categories:	Polymer; Thermoset; Epoxy; Epoxy, Encapsulating, Glass or Mineral Filled
Material Notes:	Description: Cosmic E4940S is a mineral filled epoxy molding compound which is supplied in a granular form. Features: It has excellent dimensional stability, improved thermal cycling and exceptional moisture resistance. Standard spiral flow range is 25-35” (EMMI) at 1500C and 1000 psi. It has a hot plate gel time of 22-30 seconds at 1600C, and 18-26 seconds at 1820C. It has a shelf life of eight months when stored at 50C. Applications: It is designed for use in high-volume encapsulation of resistor networks and fiber-optic connectors requiring high quality, reliability and good moldability. Information provided by Cosmic Plastics Inc
Vendors:	No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
Printer friendly version Download as PDF Download to Excel (requires Excel and Windows) Export data to your CAD/FEA program Add to Folder:

Physical Properties	Metric	English	Comments

Specific Gravity	1.85 g/cc	1.85 g/cc
Bulk Factor	2.0 - 5.0	2.0 - 5.0
Water Absorption	0.25 % @Temperature 50.0 °C, Time 173000 sec	0.25 % @Temperature 122 °F, Time 48.0 hour
Linear Mold Shrinkage	0.0020 - 0.0040 cm/cm	0.0020 - 0.0040 in/in

Mechanical Properties	Metric	English	Comments
Hardness, Barcol	65	65
Tensile Strength at Break	82.7 MPa	12000 psi
Flexural Strength	103 MPa	15000 psi
Flexural Modulus	13.8 GPa	2000 ksi
Compressive Strength	193 MPa	28000 psi
Izod Impact, Notched	0.267 J/cm	0.500 ft-lb/in

Electrical Properties	Metric	English	Comments
Volume Resistivity	1.00e+15 ohm-cm	1.00e+15 ohm-cm
Surface Resistance	1.00e+15 ohm	1.00e+15 ohm
Dielectric Constant	3.9 @Frequency 1000 Hz	3.9 @Frequency 1000 Hz	Wet
	4.3 @Frequency 1e+6 Hz	4.3 @Frequency 1e+6 Hz	Wet
Dielectric Strength	13.8 kV/mm	350 kV/in	Wet, step by step
Dielectric Breakdown	56 V	56 V	Wet, step by step
Dissipation Factor	0.011 @Frequency 1e+6 Hz	0.011 @Frequency 1e+6 Hz	Wet
	0.012 @Frequency 1000 Hz	0.012 @Frequency 1000 Hz	Wet
Arc Resistance	180 sec	180 sec

Thermal Properties	Metric	English	Comments
CTE, linear	20.0 µm/m-°C	11.1 µin/in-°F	Alpha 1
	70.0 µm/m-°C	38.9 µin/in-°F	Alpha 2
Thermal Conductivity	0.669 W/m-K	4.64 BTU-in/hr-ft²-°F
Heat Distortion Temperature	260 °C	500 °F
Glass Transition Temp, Tg	175 °C	347 °F
Flammability, UL94	V-0 @Thickness 3.17 mm	V-0 @Thickness 0.125 in

Processing Properties	Metric	English	Comments
Mold Temperature	150 - 180 °C	302 - 356 °F

Descriptive Properties
Molding Pressure	500-8000 psi

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

PCOSM022 / 190804

	Advertise with MatWeb!
	Data sheets for over 180,000 metals, plastics, ceramics, and composites.
	HOME • SEARCH • TOOLS • SUPPLIERS • FOLDERS • ABOUT US • FAQ • LOG IN

System Message